lol, I lowered mine 60mm on spax springs, and with the 17s on I could have 6 pplz in (should you want to...) and could go over humps no probs.
Didnt have it on 15s for too long to experience problems with pplz in the car, But you wouldnt have problems with rubbing, the only prob will be the front splitter chaffing on things like steep drives etc etc.